Improvement in safety-valve apparatus



U Nrrnn 4S'IA'rns LPA'IEN'r OFFICE.,

LEoNIDAs Moonn, or LouisvrrfLE, KEN'TUQKY.

[IMPROVEMENT IN SAFETY- VALVE APPARATUS.

Specification forming part of Letters Patent No. 174,279, dated February29, 1876; application iled January 15, 1876.

.To all whom it may concern:

Be it known that I, LEONIDAS MOORE, of Louisville, in the county of Jefferson and State 0f Kentucky, have invented a new and ImprovedSafety-Valve, of which the following is a specification:

j 1n the accompanying drawing, Figure l represents a verticallongitudinal `section of my improved vsafetyvalve, and Fig. 2 a top viewof the same.

Similary letters of reference indicate corresponding parts.

My invention relates to an improved safetyvalve arrangement for rag andstraw boilers in paper-mills', and forother purposes; and it consists oftwo valves arranged in such amanner that thepressure on the rag-boileris kept up at a uniform degree from the battery of boilers, and that theback pressure ofthe ragl boiler assists in closing the main valve whenthe required pressure is established.

ln the drawing, A represents apipe that connects the battery of boilerswith the rag-boiler, the pipeA being arranged with a main valve, B, anda supplementary valve, C. Both valves are so weighted that theyestablish jointly the required pressure in the battery of boilers. When,for instance, the'weight of the main valve is set at seventy'flve poundsand that of the supplementary valve at f'teen pounds the pressure in themain boiler is thereby'at ninety pounds. 'The pressure in the rag-boileris kept uniform by the joint working of both valves, `for as soon as thepressure in the battery of boilers increases above ninety pounds thesteam will blow oir' at the supplementary valve C. As the equilibrium ofthe valves with the pressure in the battery is interrupted, this can beregulated by observing the pressure in the battery, and preventing anyblowing off by placing the weight of the main valve at greater distancefrom the valve-stem. When the pressure on the rag-boiler falls belowtheV regular pressure towhich the valves are set,

the pressure in the battery of boilers will raise the valve, and11e-establish the required pressure in the ragboiler. The back pressurefrom the rag-boi1er, acting on the main valve, forms the main advantageof my valve arrangement.

When the main valve is opened, the steam fills rapidly the rag-boileruntil the pressure of the same is raised to fifteen pounds, when theback pressure will close the main valve, the supplementary valve actingmerely as a safety-valve in case there should be anything wrong in themain valve.

In rag and straw boilers thereis great condensation ofsteam, and whenthe steam is condensed the pressure will fall. The main valve regulatesthe supply of steam to the rag-boiler, for as soon as the pressure goesbelow fifteen pounds steam will be supplied until the regular pressureis re-established. The constant condensation and supply of steam keepsthe main valve continually workin g, and secures thereby a uniformpressure in' the ragboiler, while the supplementary valve serves' assafety-valve, and secures, with the main valve, in simple and effectivemanner the safety and efficiency of the rag-boiler, keeping the pressuretherein constantly at a uniform degree. y

Having thus described my invention, I claim aslnew and desire to secureby Letters Patent The combination, in a safety-valve apparatus, of amain regulating-valve and a supplementary safety-valve, adjusted jointlyto the pressure ot' the generating-boiler to keep the .steam at uniformpressure in the rag-boiler, and close the main valve automatically byback pressure, substantially as described.

LEONIDAS MOORE.

